[PATCH v1 00/12] Add riscv kvm accel support

Yifei Jiang posted 12 patches 2 weeks, 4 days ago
Failed in applying to current master (apply log)
hw/riscv/boot.c                    |  11 +
hw/riscv/virt.c                    |   7 +
include/hw/riscv/boot.h            |   1 +
linux-headers/asm-riscv/kvm.h      | 128 ++++++
linux-headers/linux/kvm.h          |   8 +
meson.build                        |   2 +
target/riscv/cpu.c                 |  57 +++
target/riscv/cpu.h                 |  10 +
target/riscv/cpu_helper.c          |  27 --
target/riscv/kvm-stub.c            |  30 ++
target/riscv/kvm.c                 | 610 +++++++++++++++++++++++++++++
target/riscv/kvm_riscv.h           |  25 ++
target/riscv/machine.c             |  14 +
target/riscv/meson.build           |   1 +
target/riscv/sbi_ecall_interface.h |  72 ++++
15 files changed, 976 insertions(+), 27 deletions(-)
create mode 100644 linux-headers/asm-riscv/kvm.h
create mode 100644 target/riscv/kvm-stub.c
create mode 100644 target/riscv/kvm.c
create mode 100644 target/riscv/kvm_riscv.h
create mode 100644 target/riscv/sbi_ecall_interface.h

[PATCH v1 00/12] Add riscv kvm accel support

Posted by Yifei Jiang 2 weeks, 4 days ago
This series adds both riscv32 and riscv64 kvm support, and implements
migration based on riscv.

Because of RISC-V KVM has been merged into the Linux master, so this
series are changed from RFC to patch v1.

Several steps to use this:
1. Build emulation
$ ./configure --target-list=riscv64-softmmu
$ make -j$(nproc)

2. Build kernel

3. Build QEMU VM
Cross built in riscv toolchain.
$ PKG_CONFIG_LIBDIR=<toolchain pkgconfig path>
$ export PKG_CONFIG_SYSROOT_DIR=<toolchain sysroot path>
$ ./configure --target-list=riscv64-softmmu --enable-kvm \
--cross-prefix=riscv64-linux-gnu- --disable-libiscsi --disable-glusterfs \
--disable-libusb --disable-usb-redir --audio-drv-list= --disable-opengl \
--disable-libxml2
$ make -j$(nproc)

4. Start emulation
$ ./qemu-system-riscv64 -M virt -m 4096M -cpu rv64,x-h=true -nographic \
        -name guest=riscv-hyp,debug-threads=on \
        -smp 4 \
        -bios ./fw_jump.bin \
        -kernel ./Image \
        -drive file=./hyp.img,format=raw,id=hd0 \
        -device virtio-blk-device,drive=hd0 \
        -append "root=/dev/vda rw console=ttyS0 earlycon=sbi"

5. Start kvm-acceled QEMU VM in emulation
$ ./qemu-system-riscv64 -M virt,accel=kvm -m 1024M -cpu host -nographic \
        -name guest=riscv-guset \
        -smp 2 \
        -bios none \
        -kernel ./Image \
        -drive file=./guest.img,format=raw,id=hd0 \
        -device virtio-blk-device,drive=hd0 \
        -append "root=/dev/vda rw console=ttyS0 earlycon=sbi"

Changes since RFC v6
- Rebase on recent commit 8627edfb3f1fca24a96a0954148885c3241c10f8
- Sync-up headers with Linux-5.16-rc1

Changes since RFC v5
- Rebase on QEMU v6.1.0-rc1 and kvm-riscv linux v19.
- Move kvm interrupt setting to riscv_cpu_update_mip().
- Replace __u64 with uint64_t.

Changes since RFC v4
- Rebase on QEMU v6.0.0-rc2 and kvm-riscv linux v17.
- Remove time scaling support as software solution is incomplete.
  Because it will cause unacceptable performance degradation. and
  We will post a better solution.
- Revise according to Alistair's review comments.
  - Remove compile time XLEN checks in kvm_riscv_reg_id
  - Surround TYPE_RISCV_CPU_HOST definition by CONFIG_KVM and share
    it between RV32 and RV64.
  - Add kvm-stub.c for reduce unnecessary compilation checks.
  - Add riscv_setup_direct_kernel() to direct boot kernel for KVM.

Changes since RFC v3
- Rebase on QEMU v5.2.0-rc2 and kvm-riscv linux v15.
- Add time scaling support(New patches 13, 14 and 15).
- Fix the bug that guest vm can't reboot.

Changes since RFC v2
- Fix checkpatch error at target/riscv/sbi_ecall_interface.h.
- Add riscv migration support.

Changes since RFC v1
- Add separate SBI ecall interface header.
- Add riscv32 kvm accel support.

Yifei Jiang (12):
  update-linux-headers: Add asm-riscv/kvm.h
  target/riscv: Add target/riscv/kvm.c to place the public kvm interface
  target/riscv: Implement function kvm_arch_init_vcpu
  target/riscv: Implement kvm_arch_get_registers
  target/riscv: Implement kvm_arch_put_registers
  target/riscv: Support start kernel directly by KVM
  target/riscv: Support setting external interrupt by KVM
  target/riscv: Handle KVM_EXIT_RISCV_SBI exit
  target/riscv: Add host cpu type
  target/riscv: Add kvm_riscv_get/put_regs_timer
  target/riscv: Implement virtual time adjusting with vm state changing
  target/riscv: Support virtual time context synchronization

 hw/riscv/boot.c                    |  11 +
 hw/riscv/virt.c                    |   7 +
 include/hw/riscv/boot.h            |   1 +
 linux-headers/asm-riscv/kvm.h      | 128 ++++++
 linux-headers/linux/kvm.h          |   8 +
 meson.build                        |   2 +
 target/riscv/cpu.c                 |  57 +++
 target/riscv/cpu.h                 |  10 +
 target/riscv/cpu_helper.c          |  27 --
 target/riscv/kvm-stub.c            |  30 ++
 target/riscv/kvm.c                 | 610 +++++++++++++++++++++++++++++
 target/riscv/kvm_riscv.h           |  25 ++
 target/riscv/machine.c             |  14 +
 target/riscv/meson.build           |   1 +
 target/riscv/sbi_ecall_interface.h |  72 ++++
 15 files changed, 976 insertions(+), 27 deletions(-)
 create mode 100644 linux-headers/asm-riscv/kvm.h
 create mode 100644 target/riscv/kvm-stub.c
 create mode 100644 target/riscv/kvm.c
 create mode 100644 target/riscv/kvm_riscv.h
 create mode 100644 target/riscv/sbi_ecall_interface.h

-- 
2.19.1


Re: [PATCH v1 00/12] Add riscv kvm accel support

Posted by Michal Prívozník 5 days, 1 hour ago
On 11/20/21 08:46, Yifei Jiang wrote:
> This series adds both riscv32 and riscv64 kvm support, and implements
> migration based on riscv.

What libvirt does when detecting KVM support is issuing query-kvm
monitor command and checking if both 'present' and 'enabled' bools are
true. If this is what these patches end up with we should get KVM
acceleration in Libvirt for free.

Michal